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(x%1)×0.8=(x%1)×0.7怎么解

(X-0.8)*(1-0.8)=0.8 0.2(x-0.8)=0.8 x-0.8=4 x=4.8

0.55x+0.8=(x+1)0.60.55x+0.8=0.6x+0.60.6x-0.55x=0.8-0.60.05x=0.2x=4

x ÷0.8 = 1.25x = 1.25 乘 0.8x = 1

1.25x0.7x0.8=(1.25x0.8)x0.7 =1x0.7 =0.7

x-0.8=16x16x-x=15x=-0.8x=-0.8/15=4/75

X=-0.8

解:因为(1-0.7)∶(x-5)=1.2∶0.8 = 3 : 2 所以有:3(x-5)=2(1-0.7)=0.6 ;解得:X=5.2

(x+0.5)*x=0.8 x^2+0.5x=0.8 (x+1/4)^2=4/5+1/16 x=-1/4±√345/20

10+(x-10)*0.7=x*0.8去括号得10+0.7x-7=0.8x移向得0.7x-0.8x=7-10合并同类项得-0.1x=-3化系数为1得x=30

0.8(x+x-0.7)=0.8(2x-0.7)=1.6x-0.56

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